Tropical Storm Erin is expected to start to gain strength starting on Wednesday and will likely become a hurricane either Thursday or Friday.

The National Hurricane Center is monitoring two disturbances in the Atlantic—the first poised to approach the northern Leeward Islands later this week and the second near the Cabo Verde Islands—while Hurricane Erin, now a Category 3, heads away from the Caribbean.

Tropical Storm Erin is approaching Puerto Rico and the Virgin Islands, bringing heavy rains that could cause flooding and landslides

As of Tuesday, it is the third feature in the Atlantic being tracked by the agency, behind another tropical wave and Hurricane Erin—which is both the first hurricane and first major hurricane of the 2025 Atlantic season.

Hurricane Erin will continue to strengthen as it approaches the Leeward Island and Puerto Rico, where it will threaten with tropical downpours, pounding surf and strong winds.